What is a fish eye diamond?

What is a fish eye diamond ?

There are many factors to be taken into account when buying a diamond.  We have mentioned in our world of diamonds section on our website about the 4c’s and other variables that may be seen in your diamond. see https://loyesdiamonds.ie/the-four-cs

One easily spotted and unpleasant feature that may be spotted in a badly cut diamond is a fish eye. What is a fish eye in a diamond?

What Is A Fish Eye Diamond

A fish eye is a reflection of light just inside the table of the girdle on the opposing side. This phenomenon usually occurs only in shallow-cut round diamonds. Technically the stone’s pavilion angle is situated somewhere between 39 and 41 degrees. Proportionally the table percentage is between 58.4% and 72.2%.

What this means is the diamond is too shallow and the table is too large. The girdle’s thickness and polish grade can also seriously vary the severity of the optical errors in the diamond.

Diamonds that present the fish eye effect are rated negatively in terms of their clarity. Therefore it is treated in effect like an inclusion because that is how it appears to the naked eye.

At Loyes Diamonds our advice is you should never buy a diamond with a fish eye. The mere presence of a fish eye is an instruction that the diamond has been severely cut in a very poor manner. It will not perform correctly. That is to say, it will not correctly refract the light and thus will lack all sparkle fire and scintillation.

Diamonds affected with fisheye have very cheap carat prices. Particularly compared to otherwise similar, unaffected stones hence you may see a diamond for sale at a considerably reduced price.

Diamonds On A Tight Budget

If you are on a tight budget and looking for a large stone and also are not bothered by its optical performance.  Buying a stone with a slight case of fisheye might be just the thing you are looking for.

Unfortunately, if this is the case Loyes Diamonds does not sell anything other than excellent cuts to very good-cut diamonds.  All of our stones are certified to the highest standards. They pass through the hands of at least 3 diamond graders. We examine each stone millimeter by millimeter. This ensures     re that only the finest diamonds make it into our diamond engagement rings and diamond jewelry.


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